public class rong {
    public static void main(String[] args) {
        StringBuilder s1 = new StringBuilder();
        System.out.println(s1.capacity());
        System.out.println(s1.length());
        s1.append("asasfdfghjkladfghjetrrevrfuihjtreuwvfhgou");
        System.out.println(s1.capacity());
        System.out.println(s1.length());
    }
}
